Press Brake Accuracy is the factor that determines you choose CNC press brake or common NC press brake. If the accuracy requirement is ±0.5 degrees and can’t be changed, then you should put your eye on the CNC press brake. The repositioning accuracy of the ram can be controlled at ±0.01mm. So for those highly precise finished products, you have to choose such a press brake with high accuracy and good performance.
However, the ram’s repositioning accuracy of NC press brake is about ±0.5mm. Under the proper condition of the punch, it still will cause ±2~3 degree deviation. Besides, CNC press brake always equipped with a CNC controller for quick punch installation and clamping. If you need to process many small parts, then this factor has to be your first consideration.
1.Closed loop
The closed loop is also known as the reaction control system. The system compares the measured value of the system output with the expected set value, and then generates an error signal, which is then manipulated and conditioned using the signal error so that the output value can approach the expected value. For example, Wuxi Shenchong, when driving, first of all, in the brain, there is a preliminary perception of the direction of travel of the car. During the journey of the car, people investigate the direction of the car with the eyes, and compare the direction and expectations of the car. The direction, in the process of constantly adjusting the direction, and finally make the car's direction of travel continuously approach the direction of the direction, and then form a closed loop control.
Closed-loop control is based on the operating conditions of various parts of the machine, with high accuracy and response speed. Due to the large number of planning elements of the closed-loop control system, the overall architecture is more chaotic and the price is higher than that of the open-loop system.
2.Open loop
Open loop is compared to closed loop, that is, open loop control does not reflect the current system control results. For example, throw something. Once something is thrown out, people can't manipulate what they throw. Because, once things leave the hands, people's manipulation of things will stop immediately.
Therefore, in the open loop system of the Press Brake, the accuracy of the bending depends on the accuracy of each part of the machine tool. The system cannot manipulate and compensate for the change in parameters generated during the bending process, and then the bending accuracy is not high. Once the outside of the machine is disturbed, the internal parameters of the machine will change. However, in terms of system planning, the open-loop planning is more simple and stable. Whether it is the device of the previous machine tool, the maintenance of the subsequent machine tool is more simplified.
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